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. 2021 May 12;21(10):3360. doi: 10.3390/s21103360

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(A): Scheme of the electrochemical oxidation of FA on GONR/SPE. (B): EIS curves of unmodified SPE (a) MOS₂-SPE (b), GNS-MoS₂ /SPE (c), MoS₂-AuNPs/SPE, (d) in 0.1 M KCl containing 5 mM Fe(CN)₆ ^3−/4−. Frequency: 0.1 Hz to 100 kHz [63].